<template>
  <div class="greetings">
    <h1>我是helloworld组件</h1>
    <h3>姓名：{{ name }}</h3>
    <h3>年龄：{{ age }}</h3>
    <button @click="add">年龄加一</button>
  </div>
</template>

<script lang="ts">
import { ref } from 'vue'

//用setup的第一种写法
export default {
  name: 'Hello_world',
  setup() {
    const name = ref('张三')
    let age = ref(18)

    function add() {
      age.value++
    }
    return { name, age, add }
  }
}
</script>
<style scoped>
h1 {
  font-weight: 500;
  font-size: 2.6rem;
  position: relative;
  top: -10px;
}

h3 {
  font-size: 1.2rem;
}

.greetings h1,
.greetings h3 {
  text-align: center;
}

@media (min-width: 1024px) {
  .greetings h1,
  .greetings h3 {
    text-align: left;
  }
}
</style>
